Mandrel for dental disks.



P. GROSS.

MANDBEL FOR DENTAL DISKS.

APPLIOATION FILED rn1a.4.1913.

Patented Aug.26,1913.

fave?? Z021" VL Y /f v UNITED STATES PATENT OFFICEc PAUL GROSS, OF DUSSELDORF, GERMANY, ASSIGNOR 'IO GENERAL DENTAL COMPANY GEBR/BER FUNKE, 0F DUSSELDORF, GERMANY.

MANDREL FOR DENTAL DISKS.

Application filed February 4, 1913.

To all whom t may concern Be it known that I, PAUL Gnoss, a` subject of the German Emperor, residing at Dusseldorf, Germany, have invented a new and useful Mandrel for Dental Disks, of which the following is a specilication.

This invention relates to a mandrel for dentists7 use, which is provided with novel and efficient means for itting a grinding, polishing or similar disk to the mandrel head.

In t-he accompanying drawing: Figure 1 is a side view partly in section of a inandrel embodying my invention; Fig. 2 a similar view with the plug and grinding disk removed; Fig. 3 an end view of the inandrel; Fig. i a section on line g/-a, Fig. 1, and Fig. 5 a side view of the plug.

The stock 4l of the mandrel A is provided at one end with a head 1, a tapering section 2, back of the head, and a bead 3 back of the tapering section. Head 1 and tapering section 2 are slitted diametrically as at 5 to subdivide the same into a pair or' opposed spring jaws, the slit 5 opening into a transverse bore 7. The two inner faces of the spring aws are grooved as at 8 and into these grooves opens a second transverse bore 9 arranged at right angles to bore 7. Tapering section 2 is encompassed by a slidable Lterrule G, by means of which the jaws may he contracted, the movement of said 'errnle being checked by bead 3.

Head 1 is provided with teeth 10 adapted to pierce the grinding, polishing or other disk l1, which is to be litted to the tool head. These teeth are adapted to enter the grooved base 15 of a plug 13 which is adapted to engage the outer face of disk 11 and to be Specification of Letters Patent.

Patented Any'. 26,1913.

serial No. 746,119.

removably secured to mandrel A. For this latter purpose, plug 13 is provided with a shank 12 which is adapted to be grasped by the spring jaws, the shank being provided with a bead or bulged section 14- which is adapted to engage grooves 8. The diameter of this bead .is a little larger than that or' the channel formed between grooves S, so that on sliding` the stem 12 .inward in the axial direction of the tool shank, the bead 1st will force the spring jaws apart, until it becomes seated within bore E) whereupon the jaws will spring together and may be locked in their contracted position by lerrule G. In this way, the dental disk 11 will become securely grasped between the plug and the head of the mandrel.

I claim:

1. A mandrel lio-r dental disks, comprising a headed stock which split to .to-rm a pair of spring jaws, grooves extending` along the inner faces or said jaws and a transverse bore opening into the grooves combined with a plug having a stem, and a bead on said stem adapted to engage the grooves.

2. A mandrel for dent-al disks, comprising a stock having a head and a tapering section back of the head, said head and tapering seetion being split to form a pair or' spring jaws, grooves extending along the inner faces of said jaws and a transverse bore opening into the grooves, combined with a plug having a stein and a bead on said stem adapted to engage the grooves, and a ferrule slidable o-n the split taperiing-stock section.

PAUL GROSS.

lVitnesses ALBERT NUFEn, HELEN Nonna.

Copies of this patent :may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

